Table 2.
Algorithm Scores for the Supraclavicular Approach Descriptive Statistics by Group (RTVG vs DVG) and Statistical Comparisons
| Trial/Group | Real-time visualization (RTV) | Delayed visualization (DV) | ||
|---|---|---|---|---|
| Median (95% CI) | IQRa | Median (95% CI) | IQR | |
| Trial 1 | 584.8 (577.1, 587.2) | 17.4 | 565.6 (559.9, 581.6) | 34.3 |
| Trial 2 | 590.2 (583.0, 593.6) | 24.4 | 576.7 (563.4, 581.9) | 30.7 |
| Trial 3 | 584.1 (569.0, 587.8) | 28.0 | ||
| Between-group comparisonsb | Wc | P | Hodges-Lehman estimator difference in medians (95% CI) | |
| RTV1 − DV1 | 1146.0 | 0.01 | 10.20 (2.2, 23.1) | |
| RTV2 − DV2 | 1163.5 | 0.007 | 10.75 (3.4, 20.9) | |
| RTV2 − DV3 | 1069.0 | 0.13 | 4.2 (−0.8, 11.4) | |
| (RTV1 − RTV2) vs. (DV1 − DV2) | 976.5 | 0.70 | ||
| (RTV1 − RTV2) vs. (DV1 − DV3) | 876.5 | 0.41 | ||
| Within-group comparisons | Md | P | Median for the difference variables (95% CI) | |
| RTV2 − RTV1 | 5.5 | 0.05 | 5.8 (0.9, 10.3) | |
| DV2 − DV1 | 6.0 | 0.09 | 3.1 (−0.1, 9.1) | |
| DV3 − DV1 | 14.0 | <0.0001 | 5.6 (2.85, 15.4) | |
| DV3 − DV2 | 4.0 | 0.28 | 1.2 (−0.9, 6.3) | |
a
Interquartile Range, the difference between upper and lower quartiles (Q1 − Q3, where Q2 is the median).
b
RTV1 = Real Time Visualization Group, Trial 1; DV1 = Delayed Visualization Group, Trial 1; DV2 = Delayed Visualization Group, Trial 2; DV3 = Delayed Visualization Group, Trial 3.
c
W is the Wilcoxon Rank Sum test statistic; the p value is based on the normal approximation with continuity correction, an adjustment that is made when a discrete distribution is approximated by a continuous distribution.
d
M is the Wilcoxon Sign test statistic.